Paul Krugman Channels Woody Allen

Now, I have Marshall McLuhan John Maynard Keynes right here. Letís ask him:

Let Z be the aggregate supply price of the output from employing N men, the relationship between Z and N being written Z = φ(N), which can be called the aggregate supply function. Similarly, let D be the proceeds which entrepreneurs expect to receive from the employment of N men, the relationship between D and N being written D = f(N), which can be called the aggregate demand function…